NEET 2021 Model Test Paper 3

Question : 70 of 180

Marks: +1, -0

The freezing point depression constant for water is +1.86°C m‌−1 . If 5.00 g Na2SO4 is dissolved in 50.0 g H O, the freezing point is changed by –3.72°C. Calculate the van't Hoff factor for Na2SO4 . (Molar mass of Na2SO4=142 )